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import sharp from "sharp"
import { createReadStream } from "node:fs"
import { extname, join } from "node:path"
import createError from "http-errors"
import type express from "express"
function transform(format: keyof sharp.FormatEnum, width?: number, height?: number): sharp.Sharp {
var transform = sharp().withMetadata()
if (format) {
transform = transform.toFormat(format)
}
if (width || height) {
transform = transform.resize({ width, height })
}
return transform
}
function errorHand(next: express.NextFunction) {
return function (err: NodeJS.ErrnoException) {
switch (err.code) {
case "ENOENT":
next()
break
case "EISDIR":
case "EPERM":
next(createError(401))
break
default:
next(err)
}
}
}
export default function (path: string) {
return async function (req: express.Request, res: express.Response, next: express.NextFunction) {
const err_handler = errorHand(next)
const filepath = join(path, req.path)
const ext = extname(filepath).substring(1)
if (![
"svg", "heic", "heif", "avif", "jpeg", "jpg", "jpe", "tile", "dz",
"png", "raw", "tiff", "tif", "webp", "gif", "jp2", "jpx", "j2k",
"j2c", "jxl"
].includes(ext)) {
return next()
}
const width = parseInt(String(req.query['width']))
const height = parseInt(String(req.query['height']))
var { format = ext } = req.query as { format?: string }
if (format == "svg") {
if (ext == "svg") {
const stream = createReadStream(filepath)
stream.on("error", err_handler)
res.format({
[format]: function () {
return stream.pipe(res)
}
})
} else {
return next(createError(400))
}
return
}
const stream = createReadStream(filepath)
stream.on("error", err_handler)
res.format({
[format]: function () {
return stream.pipe(
transform(
format as keyof sharp.FormatEnum,
!isNaN(width) ? width : undefined,
!isNaN(height) ? height : undefined
)
).pipe(res)
}
})
}
}
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